I/O Enabled VHF/UHF Data Radio Modem

IO crescendo



  • I/O support (4 x Analogue 4-20mA, Digital 0-5V or Relay dry contact)
  • Frequency Range VHF (148 MHz – 174 MHz) & UHF (380MHz – 520MHz)
  • 5 Watt transmit power (software selectable)
  • 19,200 bps (or 9,600 bps) air data rate
  • Multi-mode LED front panel display for diagnostics, including RSSI meter
  • Forward Error Correction (FEC) for high link integrity in RF-noisy environments
  • Windows-based GUI support for configuration and remote diagnostics
  • Protocol addressing and routing support, DNP-3, Modbus and IEC 870 compatibility
  • Store-and-forward repeaters for large-scale networks and coverage expansion
  • Pseudo full-duplex operation with automatic repeat request (ARQ)
  • Two RS-232 serial ports (main and auxiliary)
  • Auto-negotiating 10BASE-T and 100BASE-TX Half and Full-duplex Ethernet
  • Operating voltage 9 to 30 VDC


The Crescendo series is suited for applications in Utilities, Mining  and Transport industries where reliable long distance data transfer is critical.

The data radio can be used in small- or large-scale telemetry systems, with almost any PLC, RTU, HMI or DCS vendor for monitoring and control of critical assets.

The I/O Model provides access to analog and digital inputs and outputs in a simple, ready to use package with no need to program.

Applications include railway monitoring, pump station and tank control, irrigation, fan and pressure control, and environmental monitoring.

The radios are also used in complex GPS systems for fleet tracking and management, and high precision correctional systems for machine control and automation.


Switching Bandwidth    The user can select any 6.25kHz raster frequencies with the easy-to use Windows configuration software.
Data Reliability    User selectable Automatic Repeat Request (ARQ) offers a high level of data reliability. The immediate re-transmission of data ensures that the user will not encounter end-to-end errors or data loss even in hostile environments.
Diagnostics at a Glance    The front panel LEDs display diagnostic information indication such as Receive Signal Strength (RSSI), transmit power, radio temperature and RS232 port status.
Data Mode Options    With data and frame-driven modes available, the Ethernet Crescendo supports point-to-point, point-to-multipoint, Hayes Dial-up and multiple modes of communication.
Easy Network Management    The user is able to view diagnostics and change the settings of other remote radios within a network from a single point.
Data Integrity    Over the air data is encapsulated with Forward Error Correction, data interleaving and Cyclic Redundancy Checksums (CRC) for high level data protection.
Easy Network Configuration    The Cruise Control software allows the user to configure, save and upload radio configuration settings. This allows for multiple radios to be configured more efficiently.

Dimensions: 188mm x 102mm x 47mm
Weight: 800g
Construction: Powder coated aluminium

Serial Data: RS-232 Asynchronous with handshaking
Ethernet Data: Transparent IP links using TCP/IP gateway feature
Interface Speed: 300bps to 115200bps software selectable
Error Rate:-104 dBm for less than 1x10-6 BER (9600bps)
-102 dBm for less than 1x10-6 BER (19200bps)

Operating Voltage: 9V to 30V DC (negative ground)
Operating Current:
- Transmit @12V 1.7A nominal @ 5W
- Receive @12V 1A nominal
Operating Temp: -20 to + 70 deg C
Operating Humidity: Up to 95% non-condensing relative humidity


Antenna: BNC Female (50 Ohm), Dual BNC for Split Tx/Rx port option
Ethernet port: RJ45 (Straight through)
Serial: 2 x DB9 RS-232 Female
Power: Phoenix PH1776508 (mating connector supplied)

Frequency Range:
VHF: 148 MHz to 174 MHz software programmable
UHF: 380 MHz to 520 MHz 
Air Data Rate: 19.2 kbps (25 kHz channel), 9.6 kbps (12.5 kHz channel)
Duty Cycle: 100%
Channel Bandwidth: 12.5kHz or 25kHz (model specific)
Compliance: Designed to ACA and FCC
Modulation: Nyquist-shaped 4-level FSK
Tx key up Time: less than 1mS
Data Turn-around Time: <10mS
Transmit Power: 1.0mW (0dBm) to 5W (+37dBm)
Mode of Operation: Single-port half duplex, Split-port half duplex



RFI-450 HNMEID: Ethernet Enabled Crescendo UHF, Half Duplex, Narrow Band, 9600bps, I/O Module 
RFI-450 HWHEID: Ethernet Enabled Crescendo UHF, Half Duplex, Wide Band, 19200bps,I/O Module


RFI-150 HWHEID: Ethernet Enabled Crescendo VHF, Half Duplex, Wide Band, 19200bps, I/O Module
RFI-150 HNMEID: Ethernet Enabled Crescendo VHF, Half Duplex, Narrow Band, 9600bps, I/O Module

YY=       12: 12V nominal input voltage
              24: 24V nominal input voltage

Z=         A: 4 Digital In, 4 Relay Out
             B: 2 Analog 0-5V In, 2 Digital In, 2 Analog 0-5V Out, 2 Relay Out
             C: 4 Analog 0-5V In, 4 Analog 0-5V Out
             D: 4 Analog 4-20mA In, 4 Analog 4-20mA Out

I/O Enabled Crescendo Product Brochure  Quotation